插入句子題

 

空都在一段中

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過渡點:chemical changes and a thicker exterior; overcome the conditions. 冠詞the特指condition, 則前面句子中需要涉及到difficult condition. 因此只能在C,D中選。而另一關鍵詞chemical changes and a thicker exterior則說明前面句子中應有ancient algae的改變, 綜合這兩點,只能選擇D.  

 

空在两段中

225128h7xq8i84kkf4hni9  

過渡點either case,這說明這句話之前應該有兩個並列的case。而只有第二個插入口前一句“The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically , the water is artificially introduced by being pumped down from the surface.”這句話正好講到兩種類型的水,把句子插入之後,也邏輯合理,所以答案是第二個空。

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